GCN Circular 15195
Subject
GRB 130907A: Swift/UVOT Detection
Date
2013-09-08T17:37:39Z (11 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (UCL-MSSL) and M. J. Page (UCL-MSSL)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 130907A
74 s after the BAT trigger (Page et al., GCN Circ. 15183).
A source consistent with the XRT position (Page et al. GCN Circ. 15183)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 14:23:34.04 = 215.89183 (deg.)
Dec (J2000) = +45:36:27.1 = 45.60753 (deg.)
with an estimated uncertainty of 0.50 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 74 224 147 15.45 +/- 0.02
v 616 636 20 16.29 +/- 0.16
b 542 562 20 16.78 +/- 0.12
u 286 536 246 15.87 +/- 0.04
w1 666 1113 117 18.54 +/- 0.31
m2 641 1606 117 >19.2
w2 592 786 38 >18.7
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).